A small software corporation borrowed $292,500 to expand its software line. Some of the money was borrowed at 9%, some at 10%, and some at 12%. Use a system of equations to determine how much was borrowed at each rate if the annual interest was $29,900 and the amount borrowed at 10% was 22 times the amount borrowed at 9%. Solve the system using matrices. Step 1 Let the amount borrowed at 9% be x, the amount borrowed at 10% be y, and the amount borrowed at 12% be z. The total amount borrowed was $292,500. The total annual interest was $29,900. The amount borrowed at 10% was 2- times the amount borrowed at 9%. Write a set of equations using the information given. Convert the percentage to decimal fraction. x + y + z = 292,500 .09 x +.10 y + |.12 V z = 29,900 X x - y = 0 Write the associated augmented matrix for the given system of equations. Recall that since there are three equations in the system, the matrix will have three rows. Use the coefficients of x, y and z as entries of the first column, second column, and third column respectively. Use the constant terms in the last column. Also remember to use O for the missing coefficient of a variable. 1 :292,500 1 .09 .10 .12 : 29,900 -1

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Chapter2: Second-order Linear Odes
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A small software corporation borrowed $292,500 to expand its software line. Some of the money was
borrowed at 9%, some at 10%, and some at 12%. Use a system of equations to determine how much was
borrowed at each rate if the annual interest was $29,900 and the amount borrowed at 10% was 22 times the
amount borrowed at 9%. Solve the system using matrices.
Step 1
Let the amount borrowed at 9% be x, the amount borrowed at 10% be y, and the amount borrowed at 12%
be z. The total amount borrowed was $292,500. The total annual interest was $29,900. The amount borrowed
at 10% was 2- times the amount borrowed at 9%.
Write a set of equations using the information given. Convert the percentage to decimal fraction.
x + y + z = 292,500
.09
x +.10
y + |.12
V z = 29,900
X x - y = 0
Write the associated augmented matrix for the given system of equations.
Recall that since there are three equations in the system, the matrix will have three rows. Use the coefficients
of x, y and z as entries of the first column, second column, and third column respectively. Use the constant
terms in the last column. Also remember to use O for the missing coefficient of a variable.
1
:292,500
1
.09
.10
.12
: 29,900
-1
Transcribed Image Text:A small software corporation borrowed $292,500 to expand its software line. Some of the money was borrowed at 9%, some at 10%, and some at 12%. Use a system of equations to determine how much was borrowed at each rate if the annual interest was $29,900 and the amount borrowed at 10% was 22 times the amount borrowed at 9%. Solve the system using matrices. Step 1 Let the amount borrowed at 9% be x, the amount borrowed at 10% be y, and the amount borrowed at 12% be z. The total amount borrowed was $292,500. The total annual interest was $29,900. The amount borrowed at 10% was 2- times the amount borrowed at 9%. Write a set of equations using the information given. Convert the percentage to decimal fraction. x + y + z = 292,500 .09 x +.10 y + |.12 V z = 29,900 X x - y = 0 Write the associated augmented matrix for the given system of equations. Recall that since there are three equations in the system, the matrix will have three rows. Use the coefficients of x, y and z as entries of the first column, second column, and third column respectively. Use the constant terms in the last column. Also remember to use O for the missing coefficient of a variable. 1 :292,500 1 .09 .10 .12 : 29,900 -1
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